Tobacco Line Quality Control Calibration via Auxiliary Testing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing quality control systems in tobacco product manufacturing lines often malfunction, leading to incorrect rejection of cigarettes with normal characteristics and failure to reject those outside the limits, due to inaccuracies in programmed limit values.
Innovation Solution
An auxiliary testing unit is introduced to calibrate in-line testing units by comparing signals from in-line and auxiliary testing units, allowing for adjustments to reference values and optimizing the quality control process, ensuring accurate rejection of defective cigarettes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If in-line testing units use programmed limit values for quality control, then quality control is automated and continuous, but the programmed limit values may become inaccurate over time causing false rejections or failures to reject
Solution Approach 1:
The system implements feedback by periodically comparing in-line testing results with auxiliary testing results. The auxiliary testing unit serves as a reference standard, and when discrepancies are detected between in-line and auxiliary measurements, the system automatically adjusts the programmed limit values to maintain accuracy. This closed-loop feedback mechanism ensures the automated system remains reliable over time without manual intervention.
Solution Approach 2:
The system dynamically changes the parameter values (limit values) used in quality control based on periodic calibration against auxiliary testing. Instead of using fixed programmed values, the system automatically updates these parameters when drift is detected, allowing the automated quality control to adapt and maintain accuracy throughout operation.
2Measurement precision
If auxiliary testing unit is added for calibration, then accuracy of quality control is improved, but device complexity increases
Solution Approach 1:
The auxiliary testing unit performs preliminary calibration actions at scheduled intervals to establish accurate reference values before the in-line testing continues. By performing this calibration work in advance and periodically, the system maintains high measurement precision without requiring continuous complex operations, thus managing device complexity effectively.
Solution Approach 2:
The system implements self-service calibration where the auxiliary testing unit automatically calibrates the in-line testing units without external intervention. The microprocessor-controlled system autonomously compares measurements, detects discrepancies, and adjusts limit values, reducing the need for manual calibration operations and simplifying overall system operation despite the added auxiliary unit.
3Measurement precision
If limit values are adjusted frequently to maintain accuracy, then quality control precision is maintained, but productivity is reduced due to more rejections
Solution Approach 1:
Instead of continuous adjustment, the system performs calibration actions periodically at predetermined intervals. This periodic calibration maintains measurement precision by regularly updating limit values while minimizing disruptions to production flow. The in-line testing continues uninterrupted between calibration cycles, maintaining high productivity while ensuring accuracy is preserved through scheduled precision maintenance.
Data Source
Figure 1
Figure 2
AI summary
The quality of cigarettes advancing along a manufacturing line (1) is tested by a method that includes the steps of checking key characteristics of the cigarettes (2) as they pass through testing units (45) placed at given points along the line, so as to obtain first signals (49) reflecting the quality of the tested characteristics presented by each cigarette (2), inhibiting the operation of reject devices (47) to prevent defective cigarettes from being ejected, then taking up a given number of tested cigarettes as samples at the outfeed stage (39) of the line (1), including defective cigarettes, and directing them into an auxiliary off-line testing unit (50) by which they are checked a second time so as to obtain a second signal (57) reflecting the quality of the same characteristics; the method also includes the step of sending a signal (59) to the in-line testing units (45) so that, if the first signals (49) differ from the second signals (57), the in-line units (45) can be recalibrated, thereby optimizing the quality of the cigarettes (2) produced on a given manufacturing line or in a particular batch, and minimizing rejects.